# One label formatter per HTTP status.

codes = [404, 500, 503]

labels = {404: "not found", 500: "server error", 503: "unavailable"}

handlers = []

for code in codes:

    handlers.append(lambda: f"{code} {labels[code]}")

print([h() for h in handlers])

# expected: ['404 not found', '500 server error', '503 unavailable']

# actual:   ['503 unavailable', '503 unavailable', '503 unavailable']  (!)